I have a chevy celebrity with a 2. If a tach was an optional item on this model, then you probably have a small, inconspicuous signal wire that you can utilize. Finding it is the key. There is an actual connection I don't remember where it is that is used for cars with the sport option package. You can look in a wiring diagram or a shop manual for your car to find out, or the manufacturer of the tachometer may include connection information with the instrument, or their help department may be able to point you in the right place.
How to Install a Tachometer
How to Install a Tachometer: 8 Steps (with Pictures) - wikiHow
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How to Hook Up a Tachometer on a Lawnmower
Though this method delivers an accurate reading, installing a new tach can be confusing because of the different ignition systems used by the OEMs and the aftermarket. In either case, installing the tachometer incorrectly can cause significant damage to both the tach and ignition system. It includes diagrams for common ignition systems, including those used by General Motors, Ford, and Chrysler plus many aftermarket manufacturers. Thanks for your comment.
Installing a tachometer on your lawnmower lets you monitor its engine's speed measured in revolutions per minute rpm. If you mow dense grass, the engine can struggle to maintain power. Using a tachometer allows you to pinpoint the moments when the engine may lack enough power to cut thick grass. Once you know the limit of your engine's performance by using the tachometer, you can mow your lawn smoothly and adjust your mowing speed without overloading the engine.